July 23 (Reuters) - Hong Kong and China shares led gains inAsia on Tuesday, lifted by local media reports seen asclarifying official tolerance for slowing growth, with mainlandmarkets further buoyed by a reported delay in resuming newA-share listings.

Railway and construction material counters jumped as volumes spiked after the official Shanghai Securities News saidBeijing may use investments in high-speed railways to helpreduce overcapacity in sectors such as cement and steel.

A Shanghai Securities News report on Tuesday suggested newinitial public listings in the mainland may be further delayedif applicants have to refile corporate financial filings, whichhave a six-month validity window.

Comments from Vice Premier Zhang Gaoli also helped. Hereiterated the country's commitment to take decisive measures tosupport reasonable infrastructure and social welfare investmentto develop the export sector, service industry and small firms.